Clean up copy&paste in confirmation dialogs for prefs

chrome/browser/resources/options/browser_options.html

 <div id="settings" class="page" hidden>
   <header>
     <h1 i18n-content="settingsTitle"></h1>
   </header>
 <if expr="not pp_ifdef('chromeos')">
   <include src="sync_section.html">
 </if>
 <if expr="pp_ifdef('chromeos')">
   <section>
     <h3 i18n-content="sectionTitleInternet"></h3>
@@ skipping 118 matching lines @@
               pref="default_search_provider.enabled">
           </span>
           <button id="manage-default-search-engines"
               i18n-content="defaultSearchManageEngines">
           </button>
         </div>
         <div class="checkbox" guest-visibility="disabled">
           <label id="instant-label">
             <!-- TODO(estade): metric? -->
             <input id="instant-enabled-control" type="checkbox"
-                pref="instant.enabled">
+                pref="instant.enabled" dialog-pref>
             <!-- TODO(estade) There's a link in here which should not be inside
                  a <label>. -->
             <span i18n-values=".innerHTML:instantPrefAndWarning"></span>
           </label>
         </div>
       </div>
   </section>
   <section guest-visibility="hidden">
     <h3 i18n-content="sectionTitleUsers"></h3>
 <if expr="pp_ifdef('chromeos')">
@@ skipping 126 matching lines @@
             <span class="controlled-setting-indicator"
                 pref="safebrowsing.enabled">
             </span>
           </span>
         </span>
       </div>
 <if expr="pp_ifdef('_google_chrome')">
       <div class="checkbox">
         <label id="spelling-label">
           <input id="spelling-enabled-control" type="checkbox"
-              pref="spellcheck.use_spelling_service">
+              pref="spellcheck.use_spelling_service" dialog-pref>
           <span i18n-content="spellingPref"></span>
         </label>
       </div>
       <div id="metricsReportingSetting" class="checkbox">
         <span class="controlled-setting-with-label">
 <if expr="pp_ifdef('chromeos')">
           <input id="metricsReportingEnabled"
               pref="cros.metrics.reportingEnabled" type="checkbox">
 </if>
 <if expr="not pp_ifdef('chromeos')">
           <input id="metricsReportingEnabled"
               pref="user_experience_metrics.reporting_enabled" type="checkbox">
 </if>
           <span>
             <label for="metricsReportingEnabled" i18n-content="enableLogging">
             </label>
             <span class="controlled-setting-indicator"
                 pref="user_experience_metrics.reporting_enabled">
             </span>
           </span>
         </span>
       </div>
 </if>  <!-- pp_ifdef('_google_chrome') -->
       <div class="checkbox">
         <label>
           <input id="do-not-track-enabled" pref="enable_do_not_track"
-              metric="Options_DoNotTrackCheckbox" type="checkbox">
+              metric="Options_DoNotTrackCheckbox" type="checkbox" dialog-pref>
           <span i18n-content="doNotTrack"></span>
         </label>
       </div>
     </div>
   </section>
 <if expr="pp_ifdef('chromeos')">
   <!-- By default, the bluetooth section is hidden.  It is only visible if a
        bluetooth adapter is discovered -->
   <section id="bluetooth-devices" hidden>
     <h3 i18n-content="bluetooth"></h3>
@@ skipping 295 matching lines @@
   </section>
 </if>
 </div>  <!-- advanced-settings-container -->
 </div>  <!-- advanced-settings -->
 <footer>
   <button id="advanced-settings-expander" class="link-button"
       i18n-content="showAdvancedSettings">
   </button>
 </footer>
 </div>